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Mechanical Properties and Energy Characteristics of Flawed Samples with Two Non-Parallel Flaws under Uniaxial Compression

Author

Listed:
  • Qun Li

    (College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China)

  • Changfu Huang

    (China Railway 15th Bureau Group Co., Ltd., Shanghai 200070, China)

  • Yanbo Zhang

    (College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China)

  • Peng Liang

    (College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China)

  • Xulong Yao

    (College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China)

  • Guangyuan Yu

    (College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China)

Abstract

Unequal flaws are widespread in rock engineering, in which the extensions induced by excavation and unloading are the main factors leading to engineering instability. Rock deformation and failure are essentially the results of energy transmission. In order to study the influence of flaw type and angle on the mechanical properties and energy characteristics of the flawed rock mass, uniaxial compression tests were conducted using particle flow numerical analysis software. The results show that the crack initiation strength and peak strength of the sample increase with the increase in the flaw angle. For smaller flaw angles, the sample shows obvious plastic deformation during uniaxial compression. For larger flaw angles, the sample shows elastic–brittle properties, whose storage energy is larger. The peak strength of samples with flaws of unequal length presents an obvious decrease compared with that of flawed samples with flaws of equal length, and the extent of the reduction is 6.15% on average. Unequal flaws decrease the ability of the flawed sample to absorb strain energy. Compared with flawed samples with equal flaws, flawed samples with unequal flaws decrease the boundary energy and elastic strain energy by 9.29% and 9.95% on average, respectively. Flaws of unequal length in this sample can weaken the performance of the flawed sample.

Suggested Citation

  • Qun Li & Changfu Huang & Yanbo Zhang & Peng Liang & Xulong Yao & Guangyuan Yu, 2022. "Mechanical Properties and Energy Characteristics of Flawed Samples with Two Non-Parallel Flaws under Uniaxial Compression," Sustainability, MDPI, vol. 15(1), pages 1-15, December.
    • Handle: RePEc:gam:jsusta:v:15:y:2022:i:1:p:459-:d:1016876
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    References listed on IDEAS

    as
    1. Bin Yu & Jingyi Xi & Zhonghui Chen & Lingfan Zhang, 2019. "Interaction Analysis of Collinear Two Cracks with Unequal Length under Uniaxial Traction," Mathematical Problems in Engineering, Hindawi, vol. 2019, pages 1-15, May.
    2. Xinwei Li & Zhishu Yao & Xiaohu Liu & Xianwen Huang, 2022. "Energy Evolution and Damage Mechanism of Fractured Sandstone with Different Angles," Energies, MDPI, vol. 15(4), pages 1-16, February.
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